I have three 600ex-rt on preorder and the st-e3-rt. I've been thinking, for the money I could instead get the 24mm TSE, the fishy zoom, or the Zeiss 18mm.
I have the 16-35II, 24-105 and 70-200/2.8, and two older flashes, plus the 5dmkii. I like shooting wide most of the time, and tight family portraits. I hate using the optical wireless, and need more flashes anyhow (have been holding out for RT). The three lenses are also on my list, but no immediate need with the 16-35.
I could use some advice, since I'm not buying a 2012 body (so have budget), which purchase do you think will give the most chance to develop and explore? It seems like the flashes are the logical step, but a new lens might be a good direction, (especially a prime) and yes I don't want third party wireless.